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Question

Extraction gold and silver involves leaching with CN ion. Silver is later recovered by:

A
Liquation
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B
Distillation
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C
Zone refining
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D
Displacement with Zn
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Solution

The correct option is D Displacement with Zn
Zn being more reactive than Ag and Au, displace them.
From the native ore,

4Ag+8NaCN+2H2O+O2Leaching−−−−4Na[Ag(CN)2]Soluble Sodium dicyanoargentate(I)+4NaOH2Na[Ag(CN)2]+ZnDisplacement−−−−−−−Na2[Zn(CN)4]+2Ag

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